Drawn electrode.



W. G. ABBOTT, JR.

DRAWN ELECTRODE.

APPLICATION r1150 APR.24. 1912.

1,157,280. Patented 001. 19, 1915.

WFTNESEEE INS/ENTER MLLJAM 5'. 35010", M (a 14% WL 9M1 v TTQHNEZY'I.

M Hrs WILLIAM ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

mamwn ELECTRODE.

Specification of Letters Patent.

Application filed April 24, 1912. Serial No. 692,955.

To all whom it may concern:

' Be it known that I,-W'1LLIAM G. Anno'r'r, J r., a citizen of the United States, residing at Milford, county of Hillsboro, State of New Hampshire, have invented certain new and useful Improvements in Drawn Electrodes, of which the following is a specification.

My invention relates to luminous arc lump electrodes, and its object is the production of an electrode of great anduniform density, which shall have a longer life than has heretofore been practicable and whose light giving properties are also increased.

This application is a continuation in iplart of my application Serial No. 564,489, led June 1, 1910.

The so-called magnetiteand titanium carbid electrodes, which are now widely used, are ordinarilyconstructed by filling into a metal tube,-usually an iron tube, the magnetite or the titanium carbid mixture by grinding that mixture'and gradually introducing the ground material into thetube, the lower end of which is closed, and shaking and jarring the tube while the filling is introduced, so as to compact the filling wlthin the'tube as much as possible. The compacting of the filling is also sometimes aided by a rod or plunger, the object being to put into the tube as much of the magnetite or the titanium mixture as possible. By this process of making the electrode the amount of material that can be compacted withln the tube is very limited, and moreover the densit of the mixture in different parts ofthe tu e is different. In consequence thereof the electrode has but a comparatively short life and its rate of consumption is not uniform throughout its whole length and the light emitted by the successive portions of the electrode is not the same.

It is the object of my invention to greatly increase the amount of material that can be compacted within the electrode tube and to makethe electrode material of uni ormandl superior density throughout its whole length. At the same time by the process which I emlo gmalller diameter than is practicable by the old process and the walls of the electrode can be made almost as thin as desired, whereby a very long, thin and flexible electrode is obtained which may be wound on a drum and gradually unwound from the same and the electrode can be made of a much PatentedOct. 1'9, 1915. i

G. ABBOTT, J'B..,1 OF MILFORD, NEW HAMPSHIRE, ASSIGNOR T0 GENERAL fed toward the com anion electrode Me'cha-nism for thus utilizing the thin, flexible electrode which can be made by my improved process I have shown in another a plication filed June 1, 1910, Serial 0. 564,488; but my electrode need not necessarily be used with such mechanism-but may be used with any of the. well known are lamp mechanisms. l i

. In the accompanying drawing I have llustrated the structure with which I start in the practice of my process, and two forms of electrodes resulting from that process as follows: Figures 1 and 2 show an elevation "and cross-section, respectively, of theelectrode blank with which my process starts;

Figs. 3 and 4 illustrate in elevation and cross-section, respectively, a thin, flexible electrode resulting from my process; 'and Figs. 5 and 6 ,illustrate in elevation and cross-section, respectively, a stranded, flexi ble electrode resulting from myprocess.

The electrode blank, with which I start, 1s shown in Figs. 1 and 2, and this may be elther a magnetiteor a titanium carbid elec'-' .trode of the ordinary kind, but for my process this electrode blank is made considerably larger in diameter than such electrodes which are designed for immediate use. By preference the electrode blank is made one inch in diameter and the tube a has more than ordinary thickness. The filling b, whichmay bea magnetite mixture or a titanium carbid mixture, is supposed to' have been filled into that tube in the ordinary way, compacted by shaking, and possibly by the use of a plunger. The electrode blank thus made, if used in a lamp, has the defects which I have heretofore pointed out. Now this blank, inaccordance with my invention, is subjected either to a rolling or swaging or 'a drawing process, in the latter case through a number of successively smaller dies, whereby the walls of the tube become gradually thinner and the material within the tube becomes compacted very densely and uniformly throughout its whole length, so that its density is very much greater than the filling in the electrode blank, or, which is the same thing, in the ordinary electrode. By my process the rolling, swaging or drawing of the electrode can be continued until its diameter becomes very small and its walls very thin, the only limiting feature of this process being the-limit of ductility of the material of the tube. If

tinued until the tube has been reduced to the size indicated at c'in Figs. 5 and 6, a 'number of the. thin tubes maybe stranded together, as illustratekand the resulting electrode maybe used either as a flexible structure on a drum, etc., or, it may be cut into suitable lengths andused in the ordinary way.

It will be understood from the foregoing that my invention is not dependent upon any particular electrode filling, since this may be chosen as desired; but the invention is par ticularly applicable and particularly useful with magnetite'mixtures or titanium carbid mixtures, with both of which I have obtained excellent results, the electrode mate- I rial within the tube being' in these cases practically as solid as a rock and as homogeneous 1n appearance as cast material.

' intmaao I In the appended claims I shall refer to my improved electrode as a drawn electrode,- "with the understanding that all processes for solidly compacting the material 'in a tube by compressing the diameter and thereby extending the length of the blank are, for the purposes of my. invention, equivalent processes.

. What I claim as new and desire to secure by Letters Patent of the United States, is,'

1. A drawn arc light electrode composed of a metal sheath and are feeding material compacted therein.

2. A flexible drawn arc-light electrode composed-of a metal sheath filled'with compacted are feeding material.

3. A drawn arc-light electrode composed of a sheath'of mild steel having are feeding material compacted therein. 7

4. A drawn arc-light electrode composed of a sheath of mild steel having a magnetite mixture as the arc feeding material com pacted therein.

Inwitness whereof, I have hereunto 'set my hand this ninth day of April, 1912.

a WILLIAM G.-ABBOTT, JR. 7

Witnesses:

MATTHEW H. YORK,

J. H. WIPOCK. 

